PERFORCE change 71656 for review
trhodes at FreeBSD.org
Wed Feb 23 19:41:59 GMT 2005
On Wed, 23 Feb 2005 12:38:02 -0500
John Baldwin <jhb at freebsd.org> wrote:
> On Wednesday 23 February 2005 06:58 am, Robert Watson wrote:
> > http://perforce.freebsd.org/chv.cgi?CH=71656
> > Change 71656 by rwatson at rwatson_paprika on 2005/02/23 11:58:23
> > If oldp is set, sysctl returns the value of a MIB entry before
> > modification, rather than after.
> This is kind of wrong. I tried to explain to Tom what should be done but he
> didn't really get it. The correct order of operations should be this:
> oldrule = ...;
> That is, the point is to do the entire read old and write new bit in a single
> locked section. This more closely matches how most system calls work where
> they copyin() the arguments, perform actions, then copyout() the results.
You're right, from the previous email I didn't really get what
you were trying to say. My bad.
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